Long shaft expanding excavation deslagging lifting mechanism

Abstract

The utility model discloses a long vertical shaft expanding excavation deslagging lifting mechanism, belongs to the technical field of lifting mechanisms, and solves the problems that in the prior art, a lifting system is poor in stability in the deslagging lifting process, a deslagging barrel or a deslagging disc is prone to colliding with a well body, so that disintegrating slag in the deslagging barrel or the deslagging disc and rock on the well wall fall off, and the service life of the lifting system is prolonged. The construction safety and the construction efficiency are influenced. The device comprises a derrick installed on a well mouth, a hoisting mechanism arranged on the derrick, a guide rail structure arranged on the derrick and arranged in an upper vertical shaft, and a deslagging trolley matched with the guide rail structure and the hoisting mechanism, and the limiting structure is arranged on the guide rail structure in a sliding manner and fixes the deslagging trolley on the guide rail structure. The slag discharging device is used for expanding excavation and slag discharging of the long vertical shaft.

Description

Technical Field

[0001] The invention discloses a long vertical shaft expansion and slag removal lifting mechanism, which is used for the long vertical shaft expansion and slag removal and belongs to the technical field of lifting mechanisms. Background Art

[0002] Due to the complex geological conditions and engineering realities of long-distance shaft excavation for pumped-storage power generation, the long shaft consists of multiple vertical sections (including an upper shaft located on the wellhead side) and horizontal shafts connected to each section via upper and / or lower bends. Conventional technology utilizes a similar method for slag removal during the excavation of both the surge tank and the upper shaft. The upper and lower bends serve as platforms for slag removal. To ensure sufficient operating space for the raise boring rig and subsequent concrete construction equipment, the upper bend was partially excavated. Similarly, to facilitate pilot shaft layout, the bottom of the lower bend was partially excavated. This excavation was backfilled with the same grade of concrete during the shaft lining. The upper shaft was excavated using manual drilling combined with a YT28 pneumatic drill, using full-section blasting from top to bottom. A 10-ton and a 5-ton double-drum winch were installed in the headrace tunnel as the hoisting system, and a safety guardrail was installed at the shafthead. After blasting, the lifting system is used to lift the 0.2m³ backhoe excavator to the tunnel face for cross-section slag removal and hazard removal work.

[0003] However, the following technical problems exist in using the existing lifting system to lift and discharge slag from the upper shaft:

[0004] The poor stability during the slag lifting process can easily cause the slag bucket or slag tray to collide with the well body, causing the broken slag in the slag bucket or slag tray and the rock on the well wall to fall off, affecting construction safety and efficiency. Utility Model Content

[0005] The purpose of the utility model is to provide a slag lifting mechanism for expanding and excavating a long vertical shaft, so as to solve the problem that the lifting system in the prior art has poor stability during the slag lifting process, which easily causes the slag bucket or slag plate to collide with the well body, thereby causing the broken slag in the slag bucket or slag plate and the rock on the well wall to fall off, affecting the construction safety and construction efficiency.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A slag lifting mechanism for expanding and excavating a long vertical shaft includes a derrick installed on the wellhead, a hoisting mechanism arranged on the derrick, the hoisting mechanism including a hoisting frame and a winding rope, a guide rail structure arranged on the derrick and placed in the upper vertical shaft, a slag trolley cooperating with the guide rail structure and the hoisting mechanism, and a limiting structure slidably arranged on the guide rail structure to fix the slag trolley on the guide rail structure.

[0008] Furthermore, the guide rail structure includes a connecting rod arranged on the derrick, a guide rail body arranged on the connecting rod, and the guide rail body includes a plurality of guide rail units that movably cooperate with each other.

[0009] Furthermore, the guide rail unit includes two guide rails that cooperate with the connecting rod or adjacent guide rail units, and a connecting member connecting the two guide rails, which are respectively provided with a connecting groove and a connecting protrusion at both ends of the guide rails, a fixing hole A is provided on one opposite side of the connecting groove, and a fixing hole B that cooperates with the fixing hole A is provided on the connecting protrusion, and the fixing hole A and the fixing hole B cooperate with a bolt and a nut;

[0010] The connecting rod is provided with a block and a groove body that match the connecting groove and the connecting protrusion on the adjacent guide rail unit, and the block and the groove body are respectively provided with a fixing hole C and a fixing hole D that match the fixing hole A and the fixing hole B;

[0011] A longitudinal T-shaped sliding groove is provided on the guide rail, and the limiting structure is slidably matched with the longitudinal T-shaped sliding groove.

[0012] Furthermore, the limiting structure includes a T-shaped slider that cooperates with the longitudinal T-shaped slide groove, the T-shaped slider includes a horizontal slider placed in the longitudinal T-shaped slide groove and a vertical slider connected to the horizontal slider, and a threaded hole is provided on the vertical slider at the opposite end connected to the horizontal slider, and a bolt is provided on the threaded hole to limit the slag discharge trolley on the guide rail unit.

[0013] Furthermore, a T-slot is provided at the bottom of the connecting rod;

[0014] The block and the trough are provided with a T-shaped piece which is slidably matched with the T-shaped slot and is located on both sides of the block and the trough. The T-shaped piece is provided with a screw rod which is provided with a fixing plate and a fixing nut.

[0015] Furthermore, the connecting member includes a transverse connecting member provided at both ends of the guide rail and an oblique connecting member connected to the connection between the transverse connecting member and the guide rail.

[0016] Furthermore, in the two matching guide rail units, two adjacent horizontal connecting members are connected by an I-shaped connecting member. The I-shaped connecting member includes two horizontal members and a vertical member connected to the two horizontal members. The horizontal connecting member matching the I-shaped connecting member and the horizontal member are provided with threaded mounting holes that match the bolts.

[0017] Furthermore, the slag discharge trolley includes a car body, a mounting hole provided on a side of the car body and cooperating with the limiting structure, and a hanging ring provided on the car body and cooperating with the winding rope of the hoisting mechanism.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] First, the utility model sets a guide rail structure in the upper shaft, and sets a limit structure on the guide rail structure to limit the position of the slag trolley. When the hoisting mechanism drives the slag trolley to move in the upper shaft by retracting and releasing the winding rope of the hoisting frame, the shaking and collision of the slag trolley during the lifting process are reduced, thereby avoiding the falling of broken slag and rocks on the shaft wall, reducing construction safety risks and improving construction efficiency.

[0020] Second, the guide rail structure of the present invention includes a connecting rod provided on the derrick, a guide rail body provided on the connecting rod, and the guide rail body includes multiple sections of movable and coordinated guide rail units, so that the guide rail structure can adapt to the length of the upper shaft to ensure that the slag trolley can pass smoothly;

[0021] 3. The guide rail unit in the present invention includes two guide rails, a connector, a connecting groove and a connecting protrusion, etc., which not only has high structural strength, but can also be quickly assembled and disassembled as needed, thereby improving the flexibility and efficiency of construction. The fixing holes A and B are connected together using bolts and nuts to ensure that the connection between the guide rail units is firm and reliable, and can withstand heavy loads and high-intensity construction environments. At the same time, it is also convenient to match the fixing holes C and D on the block and trough with the connecting grooves and connecting protrusions on the adjacent guide rail units to achieve the fixation of the guide rail body on the connecting rod;

[0022] Fourth, the utility model uses a T-shaped slider to enable the slag trolley to slide stably on the guide rail during the lifting process, reducing potential dangers caused by shaking or deviation. The threaded holes and bolts are convenient for limiting and fixing the slag trolley, ensuring that the trolley will not accidentally fall off the guide rail during the lifting process, thereby improving the safety of construction.

[0023] 5. The present invention provides a T-shaped slot at the bottom of the connecting rod, and sets the block and slot on the T-shaped piece. The purpose is to facilitate the adjustment of the position of the T-shaped piece in the upper shaft according to the width of the different guide rail structures, so as to adapt to different shapes of shafts and different guide rail structures.

[0024] 6. The connectors in the present invention include transverse connectors and oblique connectors that cooperate with the guide rails, thereby enhancing the strength and stability of the entire guide rail structure and being able to withstand heavy loads and high-intensity construction environments;

[0025] 7. The I-shaped connector in the present invention provides additional structural support through the combination of two horizontal members and a vertical member, thereby enhancing the connection strength and stability between two adjacent guide rail units;

[0026] 8. The cooperation between the limiting structure in the utility model and the mounting hole on the side of the slag trolley body ensures the stability and safety of the trolley during the lifting process, avoids potential dangers caused by shaking or deviation, and facilitates the stable cooperation between the hanging ring and the winding rope of the winch mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a schematic diagram of the slag discharge trolley in the utility model viewed from one side;

[0029] Figure 2 This is a schematic diagram of the guide rail structure of the present invention as viewed from the back side;

[0030] Figure 3 This is a structural diagram of the guide rail unit of the present invention as viewed from the side of the connecting protrusion;

[0031] Figure 4 This is a structural schematic diagram of the guide rail unit of the utility model viewed from the side of the connecting groove;

[0032] Figure 5 This is a schematic structural diagram of the I-shaped connector in the present utility model;

[0033] Figure 6 This is a schematic structural diagram of the connecting rod in the present utility model;

[0034] Figure 7 This is a schematic diagram of the connection between the tank body and the T-shaped piece in the utility model;

[0035] Figure 8 It is a schematic diagram of the limiting structure in the utility model;

[0036] Figure 9 This is a schematic diagram of the structure of the slag discharge trolley in the utility model;

[0037] In the figure: 1-guide rail structure, 2-slag discharge trolley, 3-limiting structure, 4-connecting rod, 5-guide rail body, 6-guide rail unit, 7-guide rail, 8-connecting piece, 9-connecting groove, 10-connecting protrusion, 11-fixing hole A, 12-fixing hole B, 13-trough body, 14-fixing hole D, 15-longitudinal T-shaped slide, 16-T-shaped slider, 17-horizontal slider, 18-vertical slider, 19-threaded hole, 20-bolt, 21-T-slot, 22-T-shaped piece, 23-screw, 24-fixing plate, 25-fixing nut, 26-horizontal connector, 27-oblique connector, 28-I-shaped connector, 29-horizontal piece, 30-vertical piece, 31-threaded mounting hole, 32-car body, 33-mounting hole, 34-hanging ring. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0041] In addition, the terms "first", "second", "third", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0042] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0043] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0044] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention can be combined with each other.

[0045] Example 1

[0046] In order to solve the problem that the lifting system in the prior art has poor stability during the slag lifting process, which easily causes the slag bucket or slag tray to collide with the well body, thereby causing the slag fragments in the slag bucket or slag tray and the rock on the well wall to fall off, affecting construction safety and efficiency, a slag lifting mechanism for long vertical shaft expansion is provided, comprising a derrick installed on the wellhead, a hoisting mechanism arranged on the derrick, the hoisting mechanism comprising a hoist frame and a winding rope (the derrick, hoist frame and winding rope are existing and not shown in the figure), a guide rail structure 1 arranged on the derrick and placed in the upper vertical shaft, a slag trolley 2 cooperating with the guide rail structure 1 and the hoisting mechanism, and a limiting structure 3 slidably arranged on the guide rail structure 1 to fix the slag trolley 2 on the guide rail structure 1.

[0047] In practice, the limiting structure is installed on the guide rail structure 1, and then the guide rail structure 1 is fixed on the derrick. After fixing, the slag trolley is matched with the winding rope and the limiting structure. When slag is needed, the slag trolley is lowered by the hoisting mechanism. During the lowering, the slag trolley is lowered to the designated position under the limiting action of the limiting structure, and the crushed slag is clamped into the slag trolley. After clamping, the slag trolley is lifted by the hoisting mechanism. During the lifting, the slag trolley can be stably lifted under the limiting action of the limiting structure. In this embodiment, the guide rail structure is set in the upper vertical shaft, and the limiting structure is set on the guide rail structure to limit the slag trolley. When the hoisting mechanism drives the slag trolley to move in the upper vertical shaft by retracting and releasing the winding rope through the winch frame, the shaking and collision of the slag trolley during the lifting process are reduced, thereby avoiding the falling of crushed slag and rocks on the well wall, reducing the construction safety risk, and improving the construction efficiency.

[0048] Example 2

[0049] Based on Example 1, the guide rail structure 1 includes a connecting rod 4 provided on the derrick, a guide rail body 5 provided on the connecting rod 4, and the guide rail body 5 includes multiple sections of guide rail units 6 that are movably matched. In practice, according to the depth of the upper shaft, multiple groups of guide rail units 6 are selected for assembly, and the limiting structure is installed on any guide rail unit. After assembly, it is matched with the connecting rod 4 welded or threaded to the derrick. The guide rail structure in this embodiment includes a connecting rod provided on the derrick, a guide rail body provided on the connecting rod, and the guide rail body includes multiple sections of guide rail units that are movably matched, so that the guide rail structure can adapt to the length of the upper shaft to ensure that the slag trolley can pass smoothly.

[0050] Example 3

[0051] On the basis of Example 2, the guide rail unit 6 includes two guide rails 7 that cooperate with the connecting rod 4 or adjacent guide rail units 6, a connecting piece 8 connecting the two guide rails 7, and connecting grooves 9 and connecting protrusions 10 respectively arranged at both ends of the guide rail 7, a fixing hole A11 is provided on one opposite side of the connecting groove 9, and a fixing hole B12 that cooperates with the fixing hole A11 is provided on the connecting protrusion 10, and the fixing hole A11 and the fixing hole B12 cooperate with the bolts and nuts; the connecting rod 4 is provided with a block and a groove 13 that cooperate with the connecting groove 9 and the connecting protrusion 10 on the adjacent guide rail unit 6, and the block and the groove 13 are respectively provided with a fixing hole C and a fixing hole D14 that cooperate with the fixing hole A11 and the fixing hole B12; the guide rail 7 is provided with a longitudinal T-shaped groove 15, and the limiting structure 3 is slidably matched with the longitudinal T-shaped groove 15.

[0052] In practice, when two guide rail units are matched, the connecting protrusions 10 are inserted into the connecting grooves 9 and fixed by bolts through the fixing holes A11 and the fixing holes B12 and the nuts. When the guide rail units are matched with the connecting rods, the connecting protrusions 10 or the connecting grooves 9 are matched with the trough body 13 and the block body, and the bolts are passed through the fixing holes B and the fixing holes D or the fixing holes A and the fixing holes C and then matched with the nuts. The guide rail units in this embodiment include two guide rails, connectors, connecting grooves and connecting protrusions, etc., which not only have high structural strength, but can also be quickly assembled and disassembled as needed, thereby improving the flexibility and efficiency of construction. The fixing holes A and B are connected together using bolts and nuts, ensuring that the connection between the guide rail units is firm and reliable, capable of withstanding heavy loads and high-intensity construction environments. At the same time, it is also convenient to match the fixing holes C and D on the block body and the trough body with the connecting grooves and connecting protrusions on the adjacent guide rail units to achieve the fixing of the guide rail body on the connecting rod.

[0053] Example 4

[0054] On the basis of Example 3, the limiting structure 3 includes a T-shaped slider 16 that cooperates with the longitudinal T-shaped chute 15. The T-shaped slider 16 includes a horizontal slider 17 placed in the longitudinal T-shaped chute 15 and a vertical slider 18 connected to the horizontal slider 17. On the opposite end connected to the horizontal slider 17, a threaded hole 19 is provided on the vertical slider 18, and a bolt 20 is provided on the threaded hole 19 to limit the slag trolley on the guide rail unit 6. When the slag trolley is lowered or lifted under the hoisting mechanism, the T-shaped slider slides and cooperates with the longitudinal T-shaped chute 15 on the guide rail. The T-shaped slider allows the slag trolley to slide stably on the guide rail during the lifting process, reducing potential dangers caused by shaking or deviation. The threaded hole and bolt are convenient for limiting and fixing the slag trolley, ensuring that the trolley will not accidentally fall off the guide rail during the lifting process, thereby improving construction safety.

[0055] Example 5

[0056] Based on Example 4, the bottom of the connecting rod 4 is provided with a T-slot 21; the block and trough 13 are provided with a T-shaped piece 22 that slidably engages with the T-slot, located on either side of the block and trough 13. The T-shaped piece 22 is provided with a screw 23, which is provided with a fixing plate 24 and a fixing nut 25. The T-slot is provided at the bottom of the connecting rod, and the block and trough are mounted on the T-shaped piece. This facilitates adjusting the position of the T-shaped piece in the upper shaft according to the required width of the guide rail structure, thereby accommodating different shaft shapes and different guide rail structures. Of course, in practice, the block or trough 13 can also be fixedly mounted on the connecting rod 4.

[0057] Example 6

[0058] Based on Example 5, the connectors 8 include transverse connectors 26 at each end of the guide rail and diagonal connectors 27 connected to the junction between transverse connectors 26 and guide rail 7. These connectors, including transverse and diagonal connectors, work in conjunction with the guide rails, enhancing the strength and stability of the entire guide rail structure, enabling it to withstand heavy loads and high-intensity construction environments. The placement of the transverse and diagonal connectors can be selected based on actual needs.

[0059] Example 7

[0060] Based on Example 6, adjacent transverse connectors 26 in two matching guide rail units 6 are connected by an I-shaped connector 28. The I-shaped connector 28 includes two transverse members 29 and a vertical member 30 connected to the two transverse members 29. The transverse connector 26 and the transverse member 29 that match the I-shaped connector 28 are provided with threaded mounting holes 31 that engage with bolts. After the guide rail units are installed, the I-shaped connector 28 is secured to the adjacent transverse connector 26 of the adjacent guide rail unit using bolts that engage with the threaded mounting holes 31. The I-shaped connector in this embodiment, through the combination of the two transverse members and the vertical member, provides additional structural support, enhancing the strength and stability of the connection between the two adjacent guide rail units.

[0061] Example 8

[0062] Based on Example 7, the slag trolley 2 includes a body 32, a mounting hole 33 provided on the side of the body 32 that cooperates with the limiting structure 3, and a hanging ring 34 provided on the body 32 that cooperates with the winding rope of the hoisting mechanism. The slag trolley is fixed to the limiting structure by bolts passing through the mounting hole and cooperating with the threaded hole in the limiting structure. The cooperation between the limiting structure and the mounting hole on the side of the slag trolley body in this embodiment ensures the stability and safety of the trolley during the lifting process, avoids potential dangers caused by shaking or deviation, and facilitates stable cooperation between the hanging ring and the winding rope of the hoisting mechanism. The size of the slag trolley is selected according to actual needs.

Claims

1. A long vertical shaft excavation slag hoisting mechanism, comprising a derrick mounted on a wellhead, a hoisting mechanism disposed on the derrick, the hoisting mechanism comprising a hoist frame and a winding rope, characterized in that: It comprises a guide rail structure (1) arranged on a derrick and placed in an upper vertical shaft, a slag discharge trolley (2) coordinated with the guide rail structure (1) and a hoisting mechanism, and a limiting structure (3) slidably arranged on the guide rail structure (1) to fix the slag discharge trolley (2) on the guide rail structure (1).

2. A long vertical shaft expansion and slag lifting mechanism according to claim 1, characterized in that: The guide rail structure (1) comprises a connecting rod (4) arranged on a derrick, a guide rail body (5) arranged on the connecting rod (4), and the guide rail body (5) comprises a plurality of movably matched guide rail units (6).

3. The long vertical shaft expansion and slag lifting mechanism according to claim 2, characterized in that: The guide rail unit (6) comprises two guide rails (7) matched with the connecting rod (4) or the adjacent guide rail units (6), a connecting member (8) connecting the two guide rails (7), a connecting groove (9) and a connecting protrusion (10) respectively arranged at both ends of the guide rail (7), a fixing hole A (11) being arranged on one opposite side of the connecting groove (9), a fixing hole B (12) matching with the fixing hole A (11) being arranged on the connecting protrusion (10), and the fixing hole A (11) and the fixing hole B (12) matching with the fixing hole A (11), and the fixing hole A (11) and the fixing hole B (12) matching with the bolt and the nut; The connecting rod (4) is provided with a block and a groove (13) that match the connecting groove (9) and the connecting protrusion (10) on the adjacent guide rail unit (6), and the block and the groove (13) are respectively provided with a fixing hole C and a fixing hole D (14) that match the fixing hole A (11) and the fixing hole B (12); A longitudinal T-shaped slide groove (15) is provided on the guide rail (7), and the limiting structure (3) is slidably matched with the longitudinal T-shaped slide groove (15).

4. The long vertical shaft expansion and slag lifting mechanism according to claim 3, characterized in that: The limiting structure (3) includes a T-shaped slider (16) matched with the longitudinal T-shaped chute (15), the T-shaped slider (16) includes a horizontal slider (17) placed in the longitudinal T-shaped chute (15) and a vertical slider (18) connected to the horizontal slider (17), and a threaded hole (19) is provided on the vertical slider (18) at the opposite end connected to the horizontal slider (17), and a bolt (20) is provided on the threaded hole (19) for limiting the slag trolley on the guide rail unit (6).

5. The long vertical shaft expansion and slag lifting mechanism according to claim 4, characterized in that: The bottom of the connecting rod (4) is provided with a T-shaped slot (21); The block and the trough (13) are provided with a T-shaped piece (22) that is slidably matched with the T-shaped slot and is located on both sides of the block and the trough (13). A screw (23) is provided on the T-shaped piece (22), and a fixing plate (24) and a fixing nut (25) are provided on the screw (23).

6. The long vertical shaft expansion and slag lifting mechanism according to claim 5, characterized in that: The connecting member (8) comprises a transverse connecting member (26) provided at both ends of the guide rail and an oblique connecting member (27) connected to the connection between the transverse connecting member (26) and the guide rail (7).

7. The long vertical shaft expansion and slag lifting mechanism according to claim 6, characterized in that: In the two matching guide rail units (6), two adjacent transverse connecting members (26) are connected by an I-shaped connecting member (28). The I-shaped connecting member (28) includes two transverse members (29), a vertical member (30) connected to the two transverse members (29), and threaded mounting holes (31) are provided on the transverse connecting member (26) and the transverse member (29) matching the I-shaped connecting member (28) to match the bolts.

8. The long vertical shaft expansion and slag lifting mechanism according to claim 7, characterized in that: The slag discharge trolley (2) includes a vehicle body (32), a mounting hole (33) provided on a side of the vehicle body (32) and cooperating with the limiting structure (3), and a hanging ring (34) provided on the vehicle body (32) and cooperating with the winding rope of the hoisting mechanism.

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